Heating unit for use in melting and keeping hydrocolloid cartridges in liquid form



FIG. 1 is a front elevational view of the heating unit for use in melting and keeping hydrocolloid cartridges in liquid form showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a top and right side perspective view thereof.

The rear and bottom of the design are flat and unornamented. 

The ornamental design for a heating unit for use in melting and keeping hydrocolloid cartridges in liquid form, as shown and described. 